esp32/boards: Add new board variant for esp32c2 devices with 2MiB flash.

Factors out the space-saving config options from `sdkconfig.d2wd` to a new `sdkconfig.flash_2MiB` file, and uses that in the new C2 FLASH_2M variant. Signed-off-by: Florent <florent@frizoncorrea.fr>
2026-01-05 03:30:14 +01:00 · 2025-09-28 13:52:22 +02:00
parent 2f88c1e795
commit cfea71da50
7 changed files with 39 additions and 15 deletions
--- a/ports/esp32/boards/ESP32_GENERIC/mpconfigvariant_D2WD.cmake
+++ b/ports/esp32/boards/ESP32_GENERIC/mpconfigvariant_D2WD.cmake
@@ -1,5 +1,6 @@
 set(SDKCONFIG_DEFAULTS
    ${SDKCONFIG_DEFAULTS}
+    boards/sdkconfig.flash_2MiB
    boards/ESP32_GENERIC/sdkconfig.d2wd
 )

--- a/ports/esp32/boards/ESP32_GENERIC/sdkconfig.d2wd
+++ b/ports/esp32/boards/ESP32_GENERIC/sdkconfig.d2wd
@@ -1,17 +1,3 @@
-# Optimise using -Os to reduce size
-CONFIG_COMPILER_OPTIMIZATION_SIZE=y
-CONFIG_COMPILER_OPTIMIZATION_PERF=n
-CONFIG_COMPILER_OPTIMIZATION_CHECKS_SILENT=y
-
-# Change maximum log level to error, to reduce firmware size.
-CONFIG_LOG_MAXIMUM_LEVEL_ERROR=y
-CONFIG_LOG_MAXIMUM_LEVEL_INFO=n
-
-# Disable SPI Ethernet driver to reduce firmware size.
-CONFIG_ETH_USE_SPI_ETHERNET=n
-
+# Setting specific to d2wd
 CONFIG_ESPTOOLPY_FLASHMODE_DIO=y
 CONFIG_ESPTOOLPY_FLASHFREQ_40M=y
-CONFIG_ESPTOOLPY_FLASHSIZE_2MB=y
-CONFIG_PARTITION_TABLE_CUSTOM=y
-CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-2MiB.csv"
--- a/ports/esp32/boards/ESP32_GENERIC_C2/board.json
+++ b/ports/esp32/boards/ESP32_GENERIC_C2/board.json
@@ -18,5 +18,8 @@
    "product": "ESP32-C2",
    "thumbnail": "",
    "url": "https://www.espressif.com/en/products/modules",
+    "variants": {
+        "FLASH_2M": "2MiB flash"
+    },
    "vendor": "Espressif"
 }
--- a/ports/esp32/boards/ESP32_GENERIC_C2/board.md
+++ b/ports/esp32/boards/ESP32_GENERIC_C2/board.md
@@ -1,3 +1,5 @@
 The following files are firmware images that should work on most ESP32-C2-based
 boards with at least 4MiB of flash and 26MHz crystal frequency. This includes
 ESP8684-WROOM and ESP8684-MINI modules.
+
+If your board has only 2MiB of flash, you should try the FLASH\_2M variant
--- a/ports/esp32/boards/ESP32_GENERIC_C2/mpconfigboard.h
+++ b/ports/esp32/boards/ESP32_GENERIC_C2/mpconfigboard.h
@@ -1,7 +1,12 @@
 // This configuration is for a generic ESP32C2 board with 4MiB (or more) of flash.

+#ifndef MICROPY_HW_BOARD_NAME
 #define MICROPY_HW_BOARD_NAME               "ESP32C2 module"
+#endif
+
+#ifndef MICROPY_HW_MCU_NAME
 #define MICROPY_HW_MCU_NAME                 "ESP32C2"
+#endif

 #define MICROPY_HW_ENABLE_SDCARD            (0)
 #define MICROPY_PY_MACHINE_I2S              (0)
--- a/ports/esp32/boards/ESP32_GENERIC_C2/mpconfigvariant_FLASH_2M.cmake
+++ b/ports/esp32/boards/ESP32_GENERIC_C2/mpconfigvariant_FLASH_2M.cmake
@@ -0,0 +1,10 @@
+set(SDKCONFIG_DEFAULTS
+    ${SDKCONFIG_DEFAULTS}
+    boards/sdkconfig.flash_2MiB
+)
+
+list(APPEND MICROPY_DEF_BOARD
+    MICROPY_HW_BOARD_NAME="Generic ESP32-C2 module with 2MiB Flash"
+    MICROPY_OPT_COMPUTED_GOTO=0
+    MICROPY_PY_NETWORK_LAN=0
+)
--- a/ports/esp32/boards/sdkconfig.flash_2MiB
+++ b/ports/esp32/boards/sdkconfig.flash_2MiB
@@ -0,0 +1,17 @@
+# Set flash size to 2MiB.
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=n
+CONFIG_ESPTOOLPY_FLASHSIZE_2MB=y
+CONFIG_PARTITION_TABLE_CUSTOM=y
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-2MiB.csv"
+
+# Disable SPI Ethernet driver to reduce firmware size.
+CONFIG_ETH_USE_SPI_ETHERNET=n
+
+# Optimise using -Os to reduce size.
+CONFIG_COMPILER_OPTIMIZATION_SIZE=y
+CONFIG_COMPILER_OPTIMIZATION_PERF=n
+CONFIG_COMPILER_OPTIMIZATION_CHECKS_SILENT=y
+
+# Change maximum log level to error, to reduce firmware size.
+CONFIG_LOG_MAXIMUM_LEVEL_ERROR=y
+CONFIG_LOG_MAXIMUM_LEVEL_INFO=n